assertThrows(IllegalStateException.class, () -> checkState(false));
  }

  public void testCheckState_simpleMessage_success() {
    checkState(true, IGNORE_ME);
  }

  public void testCheckState_simpleMessage_failure() {
    IllegalStateException expected =
        assertThrows(IllegalStateException.class, () -> checkState(false, new Message()));
    verifySimpleMessage(expected);
  }